Renaming for consistency.

Basic undocumented/unsupported combination of Child+Tooltip. The full feature needs substancially more work but this is enough for simplest cases. (#1345)

Begin: Removed asserts that got in the way of some flags combination. (#1345)

MovingWindow: Track click offset based on root window (undo 514d30d). This should not affect the patch used for #1345 as the RootWindow for Child+Tooltip window points to itself now.

Examples: SDL: Using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. (#1559) ...

Digging into sdl window/mouse stuff will also be useful for multi-viewport work.

Examples: SDL: Minor renaming.

Examples: GLFW+GL2: Renamed imgui_impl_glfw.* to imgui_impl_glfw_gl2.* for consistency and to emphasis on GL2-ness.

Examples: SDL+GL2: Renamed imgui_impl_sdl.* to imgui_impl_sdl_gl2.* for consistency and to emphasis on GL2-ness.

Examples: SDL: Minor renaming.

Examples: SDL: Using SDL_WINDOW_INPUT_FOCUS instead of SDL_WINDOW_MOUSE_FOCUS (which is ~~hovered). We should use SDL_CaptureMouse + SDL_WINDOW_MOUSE_CAPTURE_FLAG which requires SDL 2.0.4 will give it a try shortly. (#1559)

DragFloat: Fix/workaround for backends which do not preserve a valid mouse position when dragged out of bounds. (#1559)

Drag and Drop: Fix comment. Removed IMGUI_PAYLOAD_TYPE_DOCKABLE from master branch. (#143)

Drag and Drop: Increased payload type string to 12 characters instead of 8.(#143)

NewFrame(): Added an assert to detect incorrect filling of the io.KeyMap[] array earlier. (#1555) + comments.

Examples: SDL: Fixed mapping of Insert key (#1555, fix bug introduced in #1541)

Comments about Begin/End pair and handling of return value.

InputText: Minor tweak.

InputText: Cursor X position not lost when clicking outside on an item that's submitted after the InputText(). It was only noticeable when restoring focus programmatically. (#1418, #1554)

Internal: DrawData: Tidying, renaming.

Internals: DrawData: We don't need an intermediate layer for popups.

Metrics: Tweaks to hover-window-drawlist to see window bounding box.

Internals: DrawData: Refactored chunks into a ImDrawDataBuilder we can reuse.

MIssing IMGUI_API for a type with non-inline methods.

Internals: DrawData: renamed fields only (committing separately so that next commit is less nosiy).

MovingWindow: Track click offset based on MovingWindow and not its RootWindow. Followup to 3849bb4. Comments + adding a local to ease patch #1345.

Merge pull request #1551 from Crunkle/master ...

Fix incorrect header name on Linux MinGW systems.

Fix cross compilers

Internals: Merge of harmless stuff from Navigation stuff. Added GetHoveredID() internal helper.

Internals: Initializing fields in same order as declaration order + fixed uninitialized DragDropAcceptIdCurrRectSurface (was harmless)

Begin: FIx previous commit - no need to call on collapsed window. Handle manual resize (grip, border, gamepad) before setting up window DrawList main clipping rectangle. Sane (and required for viewport code). (#822, #1542)