Merge branch 'master' into navigation

Natvis: Fix ImRect expanded height display being broken and dumb. (#1569)

Natvis: Made ImGuiWindow display shorter.

Added imgui.natvis helper for visual studio users. Added to examples projects.

Examples: Comments

Demo: Tweaked example menu with colors + menu items, was currently particularly inconvenient for Nav. Will rework later. (#787)

Nav: Added io.NavFlags to hold various options. Added ImGuiNavFlags_EnableGamepad and ImGuiNavFlags_EnableKeyboard for bindings to use (#787)

Nav: Internals: Moved some enums and functions to internals, renamed ImGuiNavReadMode to ImGuiInputReadMode as well. (#787)

Nav: Menus: Fix for using Left direction inside a menu with widgets layed out horizontally. Left to close is now handled as a fallback inside EndMenu(). (#787)

Nav: Renamed ImGuiNavInput_PadLeft / etc. to ImGuiNavInput_PadLStickLeft. Renamed ImGuiNavInput_PadScrollLeft to ImGuiNavInput_PadRStickLeft, aka removing trying-too-hard semantic from the enums. (#787)

Nav: Added ImGuiNavInput_KeyLeft/Right/Up/Down set so we can differenciate gamepad/keyboard inputs. (#787)

Merge branch 'master' into navigation

Fixed old Begin() calling SetNextWindowBgAlpha() with negative values. (#1567, #1568)

Clear BgAlphaCond properly after consuming it. Fixes 9a76fd3 (#1567)

Nav: Reordered NavInput enums to match directional order of ImGuiDir_ and ImGuiKey_ + comments (#787)

Nav: Tweak/fixed popup positioning when using nav without the io.NavMovesMouse flag (it was always assuming a mouse cursor and allocating space for it) (#787) ...

Note that this bit include badly hardcoded sizes, expecting an improvement later.

Nav: Update hovered logic, so IsItemHovered and ButtonBehavior are more consistent with each other. The known case this fixes is nav focusing on a color button, tooltip appears, mouse move: previously tooltip would stay up. (#787)

Nav: Tweak GetNavInputAmount(). Split debug defines.

Comments (#1567)

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp
#	imgui_demo.cpp

Added SetNextWindowBgAlpha() helper. (#1567) particularly helpul with the marking of the old 5-parameters version of Begin() as obsolete.

Comments + added legacy renamed GetItemsLineHeightWithSpacing() as stated in the doc, fixes 6190ab0

Nav: Comments, tweaks

Internals: Exposed SetCurrentFont() in imgui_internal.h

Style: Exposed ImGuiStyleVar_WindowTitleAlign, ImGuiStyleVar_ScrollbarSize, ImGuiStyleVar_ScrollbarRounding, ImGuiStyleVar_GrabRounding + added an assert to reduce accidental breakage. (#1181)

Internals: Moved unnecessary MovingWindowMoveId field.

Tweaked FAQ.

Merge branch 'master' into navigation

Metrics: Removed context size display.

Comments