fixed bottom panel debugger exception

 - make it work in combination with the border for tabs
 - fixed updating when changing theme

editor/editor_node.cpp

@@ -308,6 +308,10 @@ void EditorNode::_notification(int p_what) {
 		}
 		_update_scene_tabs();
 
+		// debugger area
+		if (ScriptEditor::get_singleton()->get_debugger()->is_visible())
+			bottom_panel->add_style_override("panel", gui_base->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles"));
+
 		//_update_icons
 		for (int i = 0; i < singleton->main_editor_buttons.size(); i++) {
 			main_editor_buttons[i]->set_icon(gui_base->get_icon(singleton->main_editor_buttons[i]->get_name(), "EditorIcons"));
@@ -4062,29 +4066,25 @@ void EditorNode::_bottom_panel_switch(bool p_enable, int p_idx) {
 	ERR_FAIL_INDEX(p_idx, bottom_panel_items.size());
 
 	if (p_enable) {
-		// this is the debug panel wich uses tabs, so the top section should be smaller
-		if (ScriptEditor::get_singleton()->get_debugger() == bottom_panel_items[p_idx].control) {
-			Ref<StyleBoxFlat> style_panel_invisible_top = gui_base->get_stylebox("debugger_panel", "EditorStyles");
-			bottom_panel->add_style_override("panel", style_panel_invisible_top);
-		} else {
-			bottom_panel->add_style_override("panel", gui_base->get_stylebox("panel", "TabContainer"));
-		}
 		for (int i = 0; i < bottom_panel_items.size(); i++) {
 
 			bottom_panel_items[i].button->set_pressed(i == p_idx);
 			bottom_panel_items[i].control->set_visible(i == p_idx);
 		}
+		if (ScriptEditor::get_singleton()->get_debugger() == bottom_panel_items[p_idx].control) { // this is the debug panel wich uses tabs, so the top section should be smaller
+			bottom_panel->add_style_override("panel", gui_base->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles"));
+		} else {
+			bottom_panel->add_style_override("panel", gui_base->get_stylebox("panel", "TabContainer"));
+		}
 		center_split->set_dragger_visibility(SplitContainer::DRAGGER_VISIBLE);
 		center_split->set_collapsed(false);
 	} else {
 		bottom_panel->add_style_override("panel", gui_base->get_stylebox("panel", "TabContainer"));
-
 		for (int i = 0; i < bottom_panel_items.size(); i++) {
 
 			bottom_panel_items[i].button->set_pressed(false);
 			bottom_panel_items[i].control->set_visible(false);
 		}
-
 		center_split->set_dragger_visibility(SplitContainer::DRAGGER_HIDDEN);
 		center_split->set_collapsed(true);
 	}

editor/editor_themes.cpp

@@ -426,19 +426,19 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	Ref<StyleBoxEmpty> style_empty = make_empty_stylebox(default_margin_size, default_margin_size, default_margin_size, default_margin_size);
 
 	// Tabs
-	const int tab_default_margin_side = 10 * EDSCALE;
 	Ref<StyleBoxFlat> style_tab_selected = style_widget->duplicate();
+
 	style_tab_selected->set_border_width_all(border_width);
 	style_tab_selected->set_border_width(MARGIN_BOTTOM, 0);
 	style_tab_selected->set_border_color_all(dark_color_3);
 	style_tab_selected->set_expand_margin_size(MARGIN_BOTTOM, border_width);
-	style_tab_selected->set_default_margin(MARGIN_LEFT, tab_default_margin_side);
-	style_tab_selected->set_default_margin(MARGIN_RIGHT, tab_default_margin_side);
+	style_tab_selected->set_default_margin(MARGIN_LEFT, 10 * EDSCALE);
+	style_tab_selected->set_default_margin(MARGIN_RIGHT, 10 * EDSCALE);
 	style_tab_selected->set_bg_color(tab_color);
 
 	Ref<StyleBoxFlat> style_tab_unselected = style_tab_selected->duplicate();
-	style_tab_unselected->set_bg_color(Color(0.0, 0.0, 0.0, 0.0));
-	style_tab_unselected->set_border_color_all(Color(0.0, 0.0, 0.0, 0.0));
+	style_tab_unselected->set_draw_center(false);
+	style_tab_unselected->set_border_width_all(0);
 
 	// Editor background
 	theme->set_stylebox("Background", "EditorStyles", make_flat_stylebox(background_color, default_margin_size, default_margin_size, default_margin_size, default_margin_size));
@@ -688,29 +688,18 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	theme->set_stylebox("separator", "HSeparator", make_line_stylebox(separator_color, border_width));
 	theme->set_stylebox("separator", "VSeparator", make_line_stylebox(separator_color, border_width, 0, true));
 
-	// HACK Debuger panel
-	Ref<StyleBoxFlat> style_panel_debugger = style_content_panel->duplicate();
-	const int v_offset = theme->get_font("font", "Tabs")->get_height() + style_tab_selected->get_minimum_size().height + default_margin_size * EDSCALE;
-	style_panel_debugger->set_expand_margin_size(MARGIN_TOP, -v_offset);
-	theme->set_stylebox("debugger_panel", "EditorStyles", style_panel_debugger);
-
 	// Debugger
-	Ref<StyleBoxFlat> style_debugger_contents = style_content_panel->duplicate();
-	style_debugger_contents->set_default_margin(MARGIN_LEFT, 0);
-	style_debugger_contents->set_default_margin(MARGIN_BOTTOM, 0);
-	style_debugger_contents->set_default_margin(MARGIN_RIGHT, 0);
-	style_debugger_contents->set_border_width_all(0);
-	style_debugger_contents->set_expand_margin_size(MARGIN_TOP, -v_offset);
-	theme->set_constant("extra_margin", "DebuggerPanel", default_margin_size * EDSCALE + border_width);
-	theme->set_stylebox("DebuggerPanel", "EditorStyles", style_debugger_contents);
-	Ref<StyleBoxFlat> style_tab_fg_debugger = style_tab_selected->duplicate();
-	style_tab_fg_debugger->set_expand_margin_size(MARGIN_LEFT, default_margin_size * EDSCALE + border_width);
-	style_tab_fg_debugger->set_default_margin(MARGIN_LEFT, tab_default_margin_side - default_margin_size * EDSCALE);
-	theme->set_stylebox("DebuggerTabFG", "EditorStyles", style_tab_fg_debugger);
-	Ref<StyleBoxFlat> style_tab_bg_debugger = style_tab_unselected->duplicate();
-	style_tab_bg_debugger->set_expand_margin_size(MARGIN_LEFT, default_margin_size * EDSCALE + border_width);
-	style_tab_bg_debugger->set_default_margin(MARGIN_LEFT, tab_default_margin_side - default_margin_size * EDSCALE);
-	theme->set_stylebox("DebuggerTabBG", "EditorStyles", style_tab_bg_debugger);
+
+	Ref<StyleBoxFlat> style_panel_debugger = style_content_panel->duplicate();
+	style_panel_debugger->set_border_width(MARGIN_BOTTOM, 0);
+	theme->set_stylebox("DebuggerPanel", "EditorStyles", style_panel_debugger);
+	theme->set_stylebox("DebuggerTabFG", "EditorStyles", style_tab_selected);
+	theme->set_stylebox("DebuggerTabBG", "EditorStyles", style_tab_unselected);
+
+	Ref<StyleBoxFlat> style_panel_invisible_top = style_content_panel->duplicate();
+	int stylebox_offset = theme->get_font("tab_fg", "TabContainer")->get_height() + theme->get_stylebox("tab_fg", "TabContainer")->get_minimum_size().height + theme->get_stylebox("panel", "TabContainer")->get_default_margin(MARGIN_TOP);
+	style_panel_invisible_top->set_expand_margin_size(MARGIN_TOP, -stylebox_offset);
+	theme->set_stylebox("BottomPanelDebuggerOverride", "EditorStyles", style_panel_invisible_top);
 
 	// LineEdit
 	theme->set_stylebox("normal", "LineEdit", style_widget);

editor/script_editor_debugger.cpp

@@ -1045,6 +1045,8 @@ void ScriptEditorDebugger::_notification(int p_what) {
 			tabs->add_style_override("panel", editor->get_gui_base()->get_stylebox("DebuggerPanel", "EditorStyles"));
 			tabs->add_style_override("tab_fg", editor->get_gui_base()->get_stylebox("DebuggerTabFG", "EditorStyles"));
 			tabs->add_style_override("tab_bg", editor->get_gui_base()->get_stylebox("DebuggerTabBG", "EditorStyles"));
+			tabs->set_margin(MARGIN_LEFT, -EditorNode::get_singleton()->get_gui_base()->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles")->get_margin(MARGIN_LEFT));
+			tabs->set_margin(MARGIN_RIGHT, EditorNode::get_singleton()->get_gui_base()->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles")->get_margin(MARGIN_RIGHT));
 		} break;
 	}
 }
@@ -1622,7 +1624,10 @@ ScriptEditorDebugger::ScriptEditorDebugger(EditorNode *p_editor) {
 	tabs->add_style_override("panel", editor->get_gui_base()->get_stylebox("DebuggerPanel", "EditorStyles"));
 	tabs->add_style_override("tab_fg", editor->get_gui_base()->get_stylebox("DebuggerTabFG", "EditorStyles"));
 	tabs->add_style_override("tab_bg", editor->get_gui_base()->get_stylebox("DebuggerTabBG", "EditorStyles"));
+
 	tabs->set_anchors_and_margins_preset(Control::PRESET_WIDE);
+	tabs->set_margin(MARGIN_LEFT, -editor->get_gui_base()->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles")->get_margin(MARGIN_LEFT));
+	tabs->set_margin(MARGIN_RIGHT, editor->get_gui_base()->get_stylebox("BottomPanelDebuggerOverride", "EditorStyles")->get_margin(MARGIN_RIGHT));
 	add_child(tabs);
 
 	{ //debugger