Internals: BringWindowToFront() iterate front to back, faster in majority of use cases.

Revert "Internals: Added LastActiveId, LastActiveIdTimer. (#1537)" Will come up with a better design later. ...

This reverts commit 007f403.

Internals: Added LastActiveId, LastActiveIdTimer. (#1537)

Merge of minor left-overs from private work branch to reduce drifts. Should be functionally a no-op.

Fixed non-popup child windows not honoring the HiddenFrames flag (can't see a reason). Docking relies on this.

Internals: Settings api tweaks

DragDrop: Removed IsDragDropActive() (introduced a few days ago, revert 06bea36) as our use case doesn't need it anymore. Will add it if there is a real need.

Columns: Clear offsets data when columns count changed. (#1525)

Internals: Renamed ImGuiSimpleColumns to ImGuiMenuColumns to avoid confusion. Reduced internal buffer size (we only use 3 slots).

Casing tweaks + clarify license copyright (simpler/safer?) (#1346)

Renamed ImGuiSizeConstraintCallback to ImGuiSizeCallback, ImGuiSizeConstraintCallbackData to ImGuiSizeCallbackData.

Internals: NextWindow: Renamed, moved functions to member.

Internals: NextWindow: Using ImGuiCond for consistency.

Internals: refactored g.SetNextWindow fields into g.NextWindow. structure (so it can be more easily transported/copied)

Fix a memory leak of ImGuiColumnsSet's Columns vector. ImVector doesn't call destructors.

Internals: NewFrame: Shuffled some code around (to minimize upcoming patches)

Removed CalcItemRectClosestPoint() which was weird and not really used by anyone except demo code. If you need it it's easy to replicate on your side. ...

Removed internal corresponding ImRect::GetClosestPoint() for now.
Essentially revert dcaafff.

MenuBar: Fixed menu bar pushing a clipping rect outside of its allocated bound (usually unnoticeable).

Demo: Tweak. Comments. Metrics: Added some Drag and Drop info.

BeginPopupModal(): the conditional test for SetNextWindowPos() was polling the wrong window, which in practice made the test succeed all the time.

Combo: When peeking into the popup window for alignment we check if the window was active, which is more correct. (no known issue in current codebase, but we'll need that change for later)

DragDrop: Added IsDragDropActive() helper which is useful for binding to decide how to handle mouse inputs.

TreeNode: node with the ImGuiTreeNodeFlags_Leaf flag correctly disable highlight when DragDrop is active. (#143, #581)

Version 1.54 WIP

ListBox() changed signature of ListBox() to match Combo(). Still not very happy about not using const char** anymore. (#931)

Version 1.53

Moving window doesn't use accumulating MouseDelta so straying out of boundaries keeps moved window at the same spot.

Misc comments, removed duplicated IM_ARRAYSIZE macro in imgui_demo.cpp (it is now declared in imgui.h)

Renamed the emblematic ShowTestWindow() function to ShowDemoWindow(). Kept redirection function (will obsolete).

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