Fix Button clipping when internal margins exist

(cherry picked from commit 71430cdd480078e7b3e5bf748b7462429af1cce1)

scene/gui/button.cpp

@@ -327,11 +327,8 @@ void Button::_notification(int p_what) {
 			if (align_rtl_checked == HORIZONTAL_ALIGNMENT_CENTER && icon_align_rtl_checked == HORIZONTAL_ALIGNMENT_CENTER) {
 				icon_ofs.x = 0.0;
 			}
-			int text_clip = size.width - style->get_minimum_size().width - icon_ofs.width;
-			text_buf->set_width((clip_text || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) ? text_clip : -1);
-
-			int text_width = MAX(1, (clip_text || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) ? MIN(text_clip, text_buf->get_size().x) : text_buf->get_size().x);
 
+			int text_clip = size.width - style->get_minimum_size().width - icon_ofs.width;
 			if (_internal_margin[SIDE_LEFT] > 0) {
 				text_clip -= _internal_margin[SIDE_LEFT] + theme_cache.h_separation;
 			}
@@ -339,6 +336,10 @@ void Button::_notification(int p_what) {
 				text_clip -= _internal_margin[SIDE_RIGHT] + theme_cache.h_separation;
 			}
 
+			text_buf->set_width((clip_text || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) ? text_clip : -1);
+
+			int text_width = MAX(1, (clip_text || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) ? MIN(text_clip, text_buf->get_size().x) : text_buf->get_size().x);
+
 			Point2 text_ofs = (size - style->get_minimum_size() - icon_ofs - text_buf->get_size() - Point2(_internal_margin[SIDE_RIGHT] - _internal_margin[SIDE_LEFT], 0)) / 2.0;
 
 			if (vertical_icon_alignment == VERTICAL_ALIGNMENT_TOP) {