Make at least 10 items in the "Recent" files list in the IDE

[MikeyMoMo]

Please make at least 10 items in the "Recent" files list

[NicoHood]

This should be moved here:
https://github.com/arduino/Arduino/issues

However I aggree, 10 items dont take that much space compared to the other entries. Also I really exceed the 5 entries with my tests, so this would be really helpful

[ffissore]

This issue was moved to arduino/Arduino#4131