Enabled visual feedback when clicking on the empty symbol gatom to edit its value

* Before empty symbol gatom had no feedback when being clicked on and one had to start typing trusting that the object is indeed properly activated.

* Now, the object draws ... as soon as an empty (and only empty) symbol gatom is selected, so that it has text to highlight thereby letting the user know that the object is ready to receive their input. In case the symbol gatom already has content, then that content gets highlighted which serves the same purpose.

* This does not affect the float gatom.
6 jobs for visual-feedback-when-clicking-on-empty-symbol-gatom in 224 minutes and 30 seconds (queued for 346 minutes and 45 seconds)
Status Name Job ID Coverage
  Test
passed debian_stretch_x86_64_deb #21950
debian stretch x86_64

00:38:08

passed osx_10.11_x86_64_dmg #21952
osx v10.11 dmg

00:24:47

passed osx_10.8_x86_64_dmg #21953
osx v10.8 dmg

00:20:18

failed raspbian_stretch_armv7l_deb #21955
raspbian arm stretch

passed ubuntu_16.04_x86_64_deb #21951
ubuntu v16.04 x86_64

00:37:50

passed windows_i386_innosetup #21954
windows i386

01:43:25

 
Name Stage Failure
failed
raspbian_stretch_armv7l_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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