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Viewports: do not skip SetWindowPos/Size after a leftover setter echo.

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NewFrame already applies PlatformRequestMove/Resize to Pos/Size. Reusing
those flags to suppress the next Set made synchronous echoes (Win32 WM_MOVE)
drop the following drag update, so the OS window moved every other frame.
This commit is contained in:
Bjorn Schobben 2026-08-18 22:39:57 +02:00
parent a4fa54780f
commit 876005153f
1 changed files with 5 additions and 6 deletions
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11
imgui.cpp
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@ -17780,19 +17780,18 @@ void ImGui::UpdatePlatformWindows()
viewport->PlatformWindowCreated = true;
}
// Consume requests received before this update. Callbacks raised synchronously by setters below must survive
// until the next NewFrame(), so clear the old requests before invoking platform functions instead of afterward.
const bool platform_request_move = viewport->PlatformRequestMove;
const bool platform_request_resize = viewport->PlatformRequestResize;
// Consume requests received before this update. NewFrame already applied them to Pos/Size/LastPlatform*.
// A leftover flag must not suppress a later imgui-initiated Set (e.g. continued drag after a setter echo).
// Clear before invoking platform functions so synchronous setter callbacks survive until the next NewFrame().
viewport->PlatformRequestMove = viewport->PlatformRequestResize = false;
// Apply Position and Size (from ImGui to Platform/Renderer backends)
if ((viewport->LastPlatformPos.x != viewport->Pos.x || viewport->LastPlatformPos.y != viewport->Pos.y) && !platform_request_move)
if (viewport->LastPlatformPos.x != viewport->Pos.x || viewport->LastPlatformPos.y != viewport->Pos.y)
{
g.PlatformIO.Platform_SetWindowPos(viewport, viewport->Pos);
viewport->LastPlatformPos = viewport->Pos;
}
if ((viewport->LastPlatformSize.x != viewport->Size.x || viewport->LastPlatformSize.y != viewport->Size.y) && !platform_request_resize)
if (viewport->LastPlatformSize.x != viewport->Size.x || viewport->LastPlatformSize.y != viewport->Size.y)
{
g.PlatformIO.Platform_SetWindowSize(viewport, viewport->Size);
viewport->LastPlatformSize = viewport->Size;