Internals: Windows hidden with HiddenFramesRegular (but NOT HiddenFramesForResize) preserve their SizeContents, so restoring a auto-resize window after it's been hidden by tabs won't reset its size for a frame. Arguable. Let's see how it goes. (Followup to b48e295bddbf965d7382ec5578ed05d2fe601114)
diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 2026df0..9b30323 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -51,6 +51,7 @@
- Added ImGuiWindowFlags_UnsavedDocument window flag to append '*' to title without altering
the ID, as a convenience to avoid using the ### operator.
- Window: Contents size is preserved while a window collapsed. Fix auto-resizing window losing their size for one frame when uncollapsed.
+- Window: Contents size is preserved while a window contents is hidden (unless it is hidden for resizing purpose).
- Window: Resizing windows from edge is now enabled by default (io.ConfigWindowsResizeFromEdges=true). Note that
it only works _if_ the back-end sets ImGuiBackendFlags_HasMouseCursors, which the standard back-end do.
- Window: Added io.ConfigWindowsMoveFromTitleBarOnly option. Still is ignored by window with no title bars (often popups).
diff --git a/imgui.cpp b/imgui.cpp
index 3b01d09..652c409 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -4334,6 +4334,8 @@
{
if (window->Collapsed)
return window->SizeContents;
+ if (window->Hidden && window->HiddenFramesForResize == 0 && window->HiddenFramesRegular > 0)
+ return window->SizeContents;
ImVec2 sz;
sz.x = (float)(int)((window->SizeContentsExplicit.x != 0.0f) ? window->SizeContentsExplicit.x : (window->DC.CursorMaxPos.x - window->Pos.x + window->Scroll.x));
