changed: the esc key selects the entire input text now (in the input edit)
added: a test when the program is being starded which checks if the coordinates of the
main window actually pointing at the valid area (for example when someone took
his configuration file into a new computer and the new computer has a smaller screen)
added: a button 'close' on the about dialog
changed: dialogs 'add a variable' and 'add a funtion'
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@21 e52654a7-88a9-db11-a3e9-0013d4bc506e
added: checking whether an user inserts a correct value of a variable or a function
added: a last column in the variables' and functions' list is resized into the whole space
fixed: some small artefacts on the bitmap in the about dialog
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@20 e52654a7-88a9-db11-a3e9-0013d4bc506e
fixed: the program didn't save the current language into the configuration file
added: buttons Sgn, Mod
changed: now the 'error' button is active only when there's actually an error
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@18 e52654a7-88a9-db11-a3e9-0013d4bc506e
changed input edit: can have 2048 characters now
fixed: the focus (when using the tab key) didn't go from tabs into their controls
added: a button 'err' which shows us where is an error (an incorrect character etc.)
changed: diplaying an error message is from the main thread now
added: when the program calculates (for example the factorial) and an user clicks on the 'err' button
then a 'calculating...' message will be printed
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@14 e52654a7-88a9-db11-a3e9-0013d4bc506e