Variables selection dialog

## Variables selection dialog |
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| The variable selection dialog is displayed when you click on the variable selector which can be found next to most text fields in install4j. It allows you to insert a system or user variable into the text field. The variable will be inserted at the current cursor position, if you close the variable selection dialog with the [Ok] button or of you double-click on a variable in the list.

| Variables are shown with an icon which indicates their type: system variables user variables runtime variables. Runtime variables are system variables that are evaluated at runtime of the launcher or installer. They are only shown where appropriate. The combo box at the top right corner allows you to display system variables and user variables (the default) or only system or user variables.

| To add a variable, you can click on [Edit variables] to invoke the variables edit dialog.