Update imgui-SFML.cpp

[pifopi]

Hello !

Quote and Tilde were deleted in the latest SFML
SFML/SFML@72cd878

Thanks in advance !

[eliasdaler]

I don't follow SFML's master, I use the latest tagged version as a baseline.
See #228. After SFML 2.6 gets released, I'll accept this commit.
Otherwise it will force everyone to use the latest SFML if they want to get new ImGui-SFML updates.

[eliasdaler]

However, this makes me a bit uncomfortable that people who use ImGui-SFML won't be able to use "bleeding edge" SFML, so maybe I should make some branch which allows you to use SFML's "master" with ImGui-SFML?

(I won't be able to maintain it myself, though, someone will need to do it)

[pifopi]

I can probably take care of this if you wish. Changes shouldn't be too massive anyway ! I checked and sadly only one of those two changes is compatible with sfml 2.5 The other isn't as far as I could see

[eliasdaler]

Hmm... I think the better solution is to do something like this:

#ifndef SFML_VERSION_MAJOR >= 3
    #define IMGUI_SFML_KEY_APOSTROPHE sf::Keyboard::Apostrophe
    #define IMGUI_SFML_KEY_GRAVE sf::Keyboard::Grave
#else
    #define IMGUI_SFML_KEY_APOSTROPHE sf::Keyboard::Quote
    #define IMGUI_SFML_KEY_GRAVE sf::Keyboard::Tilde
#endif

... and then use IMGUI_SFML_KEY_APOSTROPHE and IMGUI_SFML_KEY_GRAVE in the code

[pifopi]

I deleted my fork yesterday so i'm creating an other PR with that fix

[pifopi]

#232