Allow to disable help and test window functionality

Tweak stb_textedit integration to be lenient if another user are leaking their STB_TEXTEDIT definitions/symbols

Removed unnecessary assert (will crash well enough without) + comment

Added IsMouseDragging(), GetMouseDragDelta() given button and lock threshold. added io.MouseDragThreshold setting. (#167) ...

Removed GetItemActiveDragDelta()

Reverted 11025b3, 129339a it breaks collapsing implicit debug window

Double-clicking on resize grip doesn't keep grip active if mouse button is kept held.

Added GetMouseDragDelta() helper. No unlock threshold yet (#167)

Fixed MouseClickedPos not updated on double-click update (fix #167)

Replace assert with IM_ASSERT in few places.

InputText() last active preserve scrolling position. Reset scroll if widget size becomes bigger than contents.

InputText() update its width in case of resize initiated programmatically

InputText() removed the odd ~ characters when clipping. Tweaks and fixes of clipping.

ShowTestWindow: Added Wdigets Alignment demo under Layout section

Removed 'Accessed' flag from ImGuiWindow so GetCurrentWindow() compiles to a simpler accessor

Implicit "Debug" window hide itself based on cursor extend instead of the 'Accessed' flag.

ShowTestWindow: Graph checkbox under the label, also demo using BeginGroup/EndGroup()

IsItemhovered() include label and behave consistently (#145)

InputFloat(): fixed label alignment if total widget width forcefully bigger than space available

Remove spurious assert ...

Remove nop assert that causes warnings on Clang.

Use fabs() instead of abs() to ensure we use floating point. #164

Added style.DisplaySafeAreaPadding which was previously hard-coded (for use if you can't see the edges of your display, e.g. TV screens)

Fixed assignment order in Begin() making auto-fit size effectively lag by one frame ...

Also disabling "clamp into view" while windows are auto-fitting

Documentation tweaks and fixes

ImDrawList::AddText() takes a const ImFont*

Fixed bounding measurement of empty groups (fix #162)

ShowTestWindow(): Added simple dragging widget example.

Added CalcItemRectClosestPoint() helper.

ImDrawList: added thickness param to AddLine(). Added PushClipRectFullScreen() helper.

IsItemHovered() return false if another widget is active. Added IsItemHoveredRectOnly().

Added ImGui::GetItemActiveDragDelta() helpers for drag operations