Windows: fixed an issue where double-click to collapse could be triggered even while another item is active. (#7841, #7369)

docs/CHANGELOG.txt

@@ -72,6 +72,8 @@ Other changes:
 - InputText: added CJK double-width punctuation to list of separators considered for CTRL+Arrow.
 - Tables: fixed assertion related to inconsistent outer clipping when sizes are not rounded. (#7957) [@eclbtownsend]
 - Tables: fixed assertion with tables with borders when clipped by parent. (#6765, #3752, #7428)
+- Windows: fixed an issue where double-click to collapse could be triggered even while another
+  item is active, if the item didn't use the left mouse button. (#7841)
 - Misc: Made it accepted to call SetMouseCursor() with any out-of-bound value, as a way to allow
   hacking in custom cursors if desirable.
 - Fonts: fixed ellipsis "..." rendering width miscalculation bug introduced in 1.91.0. (#7976) [@DDeimos]

imgui.cpp

@@ -6948,9 +6948,10 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         // At this point we don't have a clipping rectangle setup yet, so we can use the title bar area for hit detection and drawing
         if (!(flags & ImGuiWindowFlags_NoTitleBar) && !(flags & ImGuiWindowFlags_NoCollapse))
         {
-            // We don't use a regular button+id to test for double-click on title bar (mostly due to legacy reason, could be fixed), so verify that we don't have items over the title bar.
+            // We don't use a regular button+id to test for double-click on title bar (mostly due to legacy reason, could be fixed),
+            // so verify that we don't have items over the title bar.
             ImRect title_bar_rect = window->TitleBarRect();
-            if (g.HoveredWindow == window && g.HoveredId == 0 && g.HoveredIdPreviousFrame == 0 && IsMouseHoveringRect(title_bar_rect.Min, title_bar_rect.Max))
+            if (g.HoveredWindow == window && g.HoveredId == 0 && g.HoveredIdPreviousFrame == 0 && g.ActiveId == 0 && IsMouseHoveringRect(title_bar_rect.Min, title_bar_rect.Max))
                 if (g.IO.MouseClickedCount[0] == 2 && GetKeyOwner(ImGuiKey_MouseLeft) == ImGuiKeyOwner_NoOwner)
                     window->WantCollapseToggle = true;
             if (window->WantCollapseToggle)