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)

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

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

Examples: Using IM_OFFSETOF macro. + Comments

Examples: Comments about invalid mouse pos.

Sisyphus says: tweaked comments about not using old-style OpenGL examples (#1459, #1394 etc.)

Examples: Added a bunch of comments/referencs related to io.WantCaptureMouse, io.WantCaptureKeyboard (#1262, #1237, #1219, #635, #1058, #1051, #912, #533, #703, #446, #459, #364, #213, #52, and more)

Examples: Comments to guide people unfamiliar with the librairies used.

Examples: Extra clarification for the 100th person who insist on using the OpenGL2 code in spite of existing documentation leaning against it. (#1394)

Examples: GL2: Renaming, comments.

Examples: GL2: rename functions to include GL2 in name

Backup polygon mode, draw with filled polygons, restore state, for clients running opengl with glPolygonMode. closes #798

IO: io.MousePos needs to be set to ImVec2(-FLT_MAX,-FLT_MAX) when mouse is unavailable/missing. Previously ImVec2(-1,-1) was enough but we'll now accept negative mouse coordinates.

Examples: OpenGL2+GLFW/SDL: Added commented out glUseProgram(0) in main.cpp for visibility (#1116)

Comments to redirect people to OpenGL3 examples (#1116)

Fixed overzealous GCC warnings (#883) + partly undo 8553bab

Added a void* user_data parameter to Clipboard function handlers. (#875)

Examples: OpenGL*: Savnig/restoring existing scissor rectangle for completeness (#807)

Examples: Accessing ImVector fields directly, feel less stl-ey and fix renderer side assert when render list only contains a callback (#810)

Examples: Renaming opengl_example/ to opengl2_example/ for clarity (1/2 because git)