Merge branch 'inolen-atlas_build_clear_font'

Font: Renamed ImFont::Clear() to ImFont::ClearOutputData() for consistency with what ImFontAtlas does. DisplayOffset is set by constructor but not reset by ClearOutputData. (#1349)

Demo: Fixed Fonts "set as default button" not having collading id on collapsed nodes.

Merge branch 'atlas_build_clear_font' of https://github.com/inolen/imgui into inolen-atlas_build_clear_font

Comments

Popups: Fixed right-click to close popups not handling modal windows properly. (~#439)

Popups: similarly to previous commit, we fix reopening a popup within a popup stack from truncating the whole stack. This is done by properly refocusing the lower level popup. (~#439)

Popups: fixed CloseInactivePopups() so that right-clicking to close one level of popups in a popups stack won't close the whole stack. This is done by properly refocusing the lower level popup. Fixes 87ae408 (~#439)

Added OpenPopupOnItemClick(); helper which mimic BeginPopupContextItem() but doesn't do the open. ...

Made the color popups uses this standard function so they handle reopening a context menu.

BeginPopupContextItem(), BeginPopupContextWindow(): Using newly introduced IsItemHovered() flags to allow reopening another context menu (over same or not same item) with right-click. (#439) (+1 squashed commits)

IsWindowHovered(): Changed default behavior to now return false is a widget from another window is active + Added support for ImGuiHoveredFlags_AllowWhenBlockedByActiveItem. (relate to drag'n drop idoms: #143)

IsItemHovered(), IsWindowHovered(): added flags to enable various and more specific behavior. Will enable improvements for popups/context menus and drag'n drop. (relate ~#439, #1013, #143, #925) ...

The legacy confusing IsItemRectHovered(), IsWindowRectHovered() can be completely removed now.
Changed IsWindowHovered() behavior with default parameter: it now return false is the window is blocked by a popup.
Demo: Added tests for those two functions.

Moved IMGUI_DISABLE_OBSOLETE_FUNCTIONS block lower in the imgui.h file so obsolete functions can use flags. Also sane to quarantine them outside of the respectable area.

Made the ImGuiWindowFlags_NoMove flag inherited from parent to child, so in a setup with RootWindow (no flag) -> Child (NoMove flag) -> SubChild (no flag) user won't be able to move the root window by clicking on SubChild. (#1381)

Fixed a bug allowing to move a _NoMove window from a child that doesn't have the flag. (#1381) ...

broken by e56eba4 (#1337)

Popups: popups can be closed with a right-click anywhere, without altering focus under the popup.(~#439)

Popups: Fixed a bug introduced in 1a35766 which made the BeginPopupContextXXX functions create popups without border. (nb: all that border mess is going away in styling clean up)

Refactor EndFrame() code that process focusing window with left mouse button. This commit should be no-op.

Demos: Tweaks of popups/context/menus section.

IO: reordering some supposedly private fields.

Internals: PaintVerts** renamed to ShadeVerts**, moved to imgui_draw.cpp and exposed in imgui_internal.h (+1 squashed commits)

Documentation: Extra comments + tweaks to make usage of long-line more bearable.

Internals: Added ImLinearSweep() helper.

Internals: RenderCollapseTriangle() -> RenderTriangle(), takes a ImGuiDir

CollapsingHeader(bool*) variant: fixed for IsItemHovered() to work properly in the nav branch.Basically the close button now has to use ItemAdd() to be navable into, which overwrite the IsItemHovered data. (#600, #787)

Internals: ButtonBehavior: made ImGuiButtonFlags_PressedOnClick and ImGuiButtonFlags_PressedOnDoubleClick set the click offset correctly + hold on g.ActiveId so Held state can be reported. Added ImGuiButtonFlags_NoHoldingActiveId flag to disable the later.

Internals:Helpers: Added ImSwap(int,int), exposed ImStrncpy().

Checkbox: Using checkmark. MenuItem: Tweaked checkmark, thicker.

Begin: Marked 5 parameters version of Begin() as obsolete. Now waiting for a riot to happen!

Begin: Work toward obsoleting the 5-arguments Begin() overload. Internal BeginEx() becomes the normal public Begin() again! (4)