Internals: Rect: Added ClipWillFull helper + comments on variations.

Internals: ImVec2 versions of ImMin, ImMax inline float version for a faster full-on-debug-no-inline experience.

InputText: Added alternative clipboard shortcuts: Shift+Delete (cut), Ctrl+Insert (copy), Shift+Insert (paste). (#1541)

InputText: Moved code for checking clipboard shortcut so we can expand on it. (#1541)

Added ImGuiKey_Insert for future use. Setup in all example bindings. (#1541)

Examples: OpenGL3+GLFW: Using 3.2 context + GLSL version 150 (#1466)

Examples: OpenGL3+SDL: Changed GLSL shader version to 150 (#1466, #1504)

Popups: Comments, reorganize bits of the header section, renamed parameters.

BeginPopup: Exposed extra_flags publicly. (#1533)

OpenPopup(): Always reopen existing popup. Removed OpenPopupEx() bool reopen_existing which is always true. This also makes the public API on par with OpenPopupEx(). (#1497, #1533)

Popups: Gently handle the user mistakenly calling OpenPopup() every frame. (when reopen_existing is true). (#1497)

Internals: Popup: Renaming fields.

Popup, Menus: Tweaks and comments.

Internals: Popup: Explicitely setting up ImGuiPopupRef reduces confusion.

Popups: Revert aca23fd (Oct 20, 2017). Because 1) I can't seem to find a default. 2) The if is definitively faulty and would have been all true. 3) It looks like possibly the following commit 6ab737a could have made this unnecessary. Not absolutly certain. (~#439)

Popup: BeginPopupContextItem(), BeginPopupContextWindow(), BeginPopupContextVoid(), OpenPopupOnItemClick() all react on mouse release instead of mouse click. Note that they don't use the full ButtonBehavior() or tracking aabb on both click and release. Applications I've tried seems to behave inconsistently there but on-release-without-tracking is both fairly common and doesn't require extra code for the id tracking. (~#439)

Internal: ButtonBehavior: Tweak to update g.ActiveIdClickOffset more consistently

Internal: Reworked FocusFrontMostActiveWindow() so it fits the Nav branch usage as well.

Internals: Popup: Separating MousePosOnOpen and PopupPosOnOpen. They are equal in the master branch but different in the navigation branch.

Internals: renamed FocusPreviousWindow() to FocusfrontMostActiveWindow()

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

Examples: DirectX9/10/11: Comments about CS_DBLCLKS + formatting tweaks. (#1538)

Merge pull request #1538 from ndandoulakis/ndandoulakis-CS_DBLCLKS-patch ...

Examples: DirectX9,10,10: Support for CS_DBLCLKS by treating double-click down messages are regular down. (#1538, #754)

Examples: Using IM_OFFSETOF macro. + Comments

CS_DBLCLKS support for DirectX 11

CS_DBLCLKS support for DirectX 10

CS_DBLCLKS support for Directx9

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

This reverts commit 007f403.

Internals: Added LastActiveId, LastActiveIdTimer. (#1537)

Examples: Visual Studio projects: Disabled extraneous function-level check in Release build.